SHINGEKI NO KYOJIN: CHIMI KYARA GEKIJOU - RIVAI-HAN

Shingeki no Kyojin Season 3 DVD/BD specials. They are chibi parody shorts; one video was included on each of the DVD/BDs for a total of four. Each video contained three stories (essentially chibi parody short episode 38–49) which continued the chibi parody story from the previous chibi parody specials included on the DVD/BDs of the previous seasons. — Description from AniList community (anilist.co).